Some few are rated at less - maybe 500 mAh and a few at higher. Modern USB phone chargers which have a USB plug as their output and which plug into a device's USB port are chargers in their own right. A charger capable of charging a phone at 5V, 2A will almost certainly also charge a tablet OK at 5V, 2A.
The more months payed for upfront, the cheaper the cost per month. E-liquid subscriptions range in price form $29.99 paid monthly, $86.97 paid every three months or $167.94 paid every six months. All three plans include shipping in the price.
The price of monthly subscription boxes can range from around $10 to upwards of $40 per box. If you purchase monthly subscriptions for 3, 6, or 12 months, there is usually a discount on the box price.